const WebSocket = require('ws')
const ws = new WebSocket.Server({ port: 3000 })
let count = 1

ws.on('connection', (obj) => {
  obj.on('message', (data) => {
    obj.send('this is a message from WebSocket')
    setInterval(() => {
      count++
      obj.send(count)
    }, 3000)
  })
})
